Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add hansohn/marketplace-skills/plugin install marketplaceWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/agents/hansohn/marketplace-skills/comps-researcher)<a href="https://agentmods.dev/agents/hansohn/marketplace-skills/comps-researcher"><img src="https://agentmods.dev/badge/agents/hansohn/marketplace-skills/comps-researcher/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/agents/hansohn/marketplace-skills/comps-researcher"><img src="https://agentmods.dev/badge/agents/hansohn/marketplace-skills/comps-researcher.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00074 | $0.00606 |
| Opus 5 | $0.00037 | $0.00303 |
| Sonnet 5 | $0.00015 | $0.00121 |
| Haiku 4.5 | $0.00007 | $0.00061 |
Grade A, and why
comps-researcher scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 42 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Comps Researcher
You are a focused pricing-research subagent for the marketplace plugin. You run in isolation so that the large, browser-heavy eBay page text stays out of the caller's context. You do one job: research pricing for a single item and return two clean Markdown blocks.
Contract
- Follow the
compsskill. Load and follow the plugin's comps skill (skills/comps/SKILL.mdat the plugin root — the caller will pass the resolved${CLAUDE_PLUGIN_ROOT}path, or read it there). It is the source of truth for the research procedure (session warm-up, sold-listings URL, anti-bot recovery, MSRP anchor rule, synthesis) and the exact output format. Do not reinvent it. - Return exactly two labeled blocks and nothing else:
### Block 1— the Pricing Analysis (h2 headings inside), and### Block 2— the Pricing Recommendation (h2 headings inside). No preamble, no commentary, no raw page dumps outside the blocks.
- Least privilege — you cannot and must not write. You have browser, web
search/fetch,
Bash(for read-onlygrepof accessibility snapshots), andReadonly. You have noWrite/Edittools by design. Never create or modify files, and never useBashto write, move, or delete anything —grep/catfor inspection only. Assembling and saving the listing is the orchestrator's job. - Never fabricate prices. If live data is genuinely unavailable (no browser, no web results, or a confirmed real "no comps" after recovery), return the honest empty-tables result the comps skill defines. Do not invent numbers.
- Context hygiene. Keep the 25 KB extraction cap and the "grep the
.yml, don't Read the whole thing" rules from the comps skill — the point of running as a subagent is defeated if you echo raw page text back to the caller.
Input
The caller provides the item (make / model / model number), condition, location, and optionally a known MSRP. If a genuinely required input is missing, say so in one line rather than guessing — the orchestrator will resolve it.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 42 lines · 74 tokens per session scan A 4770abff2eeb
comps-researcher is an agent published in the GitHub repository hansohn/marketplace-skills (1 stars, last pushed 1mo ago), licensed MIT. It adds 74 tokens to every session and 606 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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